Posted a significant update to the add-on, which has evolved into something a bit more substantial. I am shooting for a fairly full-featured framework for bridging the gap between Vaadin and Google App Engine (GAE) applications which use the GAE datastore. The standard relied upon is JDO.
The aim is to enable Vaadin-based GAE applications where the main work in building the application is defining the datastore Pojos (classes extending AbstractGAEPojo from the add-on) used by the application.
There is an included demo which allows adding, deleting, and editing a GAEPojo called SimpleBeanableClass. The demo can be viewed online at: http://gaedatastorecontainers.appspot.com/.
The external libraries now used are commons-lang 2.5 (http://commons.apache.org/lang/) and PasswordField-0.2.jar.
Jonathan